how would you light such a scene?
Final



Lights

As a light use Sun Lamp with Size 0. This will make shadows completely sharp. I've also changed Strength to 2.



World

For World I've used simple Linear Gradient to look similar to your reference image. This will give blueish tint to whole image, but we will take care of it later.



Compositing:

First of all you will need to give your objects same Pass Index. Take a look here how to do it: Object ID to a whole group.

And check Object Index under Render Layers > Passes.



Now we can use our objects as mask for Color Correction and reduce unnecessary saturation for shadows/highlights and everything we need without affecting World Background.